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Shen, C P; Adachi, I; Aihara, H; S Al Said; Asner, D M; Ayad, R; Badhrees, I; Ban, Y; Bansal, V; Behera, P; Berger, M; Bhuyan, B; Biswal, J; Bračko, M; Červenkov, D; Chen, A; Cheon, B G; Choi, Y; Cinabro, D; Cunliffe, S; S Di Carlo; Drásal, Z; Eidelman, S; Epifanov, D; Fast, J E; Fulsom, B G; Gabyshev, N; Garmash, A; Giri, A; Haba, J; Hayasaka, K; Hayashii, H; Hedges, M T; Iijima, T; Inami, K; Itoh, R; Iwasaki, Y; Jacobs, W W; Jia, S; Joo, K K; Julius, T; Kato, Y; Kichimi, H; Kim, J B; Kim, K T; Kim, S H; Kotchetkov, D; Križan, P; Kroeger, R; Krokovny, P; Y-J, Kwon; Lee, I S; L Li Gioi; Libby, J; Liventsev, D; Luo, T; Masuda, M; Matsuda, T; Miyabayashi, K; Miyata, H; Mohanty, G B; Mrvar, M; Mussa, R; Nanut, T; Natkaniec, Z; Niiyama, M; Nishida, S; Ogawa, S; Pakhlov, P; Park, H; Pestotnik, R; Piilonen, L E; Rostomyan, A; Sakai, Y; Salehi, M; Santelj, L; Sanuki, T; Shebalin, V; T-A Shibata; J-G Shiu; Tamponi, U; Tenchini, F; Uchida, M; Uglov, T; C Van Hulse; Varner, G; Vorobyev, V; Vossen, A; Wang, B; M-Z, Wang; Wang, P; Wang, X L; Watanabe, M; Watanabe, Y; Yelton, J; Yuan, C Z; Yusa, Y; Zakharov, S; Zhang, Z P; Zhilich, V
The European physical journal. C, Particles and fields, 03/2018, Volume: 78, Issue: 3Journal Article
We report the first observation of the Ξc(2930)0 charmed-strange baryon with a significance greater than 5σ. The Ξc(2930)0 is found in its decay to K-Λc+ in B-→K-Λc+Λ¯c- decays. The measured mass and width are 2928.9±3.0(stat.)-12.0+0.9(syst.) MeV/c2 and 19.5±8.4(stat.)-7.9+5.9(syst.) MeV, respectively, and the product branching fraction is B(B-→Ξc(2930)0Λ¯c-)B(Ξc(2930)0→K-Λc+)=1.73±0.45(stat.)±0.21(syst.)×10-4. We also measure B(B-→K-Λc+Λ¯c-)=4.80±0.43(stat.)±0.60(syst.)×10-4 with improved precision, and search for the charmonium-like state Y(4660) and its spin partner, Yη, in the Λc+Λ¯c- invariant mass spectrum. No clear signals of the Y(4660) nor its spin partner are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of (772±11)×106BB¯ pairs collected at the Υ(4S) resonance by the Belle detector at the KEKB asymmetric energy electron–positron collider.
